I just did the exercise on page 173 of the book. To sum up; Gary is relieved to read in the paper that his crazy ex-wife has killed herself. But then he looks up from the paper and sees her standing on the other side of the sliding glass door, holding a butcher knife. ( I have no idea how she made everyone believe that she had hung herself or what's going to happen next) I love writing exercises like this! I start with an idea (like the one you suggested) I get an image, and start writing (in my head or on paper.) the characters "tell me" about themselves and story unfolds as I write. Happens with NanoWrimo too.